Cheap Handling Fix - Where?

I haven't ever heard of anyone installing the Z brackets on the front bottom. I don't want to add doom and gloom but that seems a little risky. If you have popping I would identify the root cause of that and not modify the design to attempt to cover it up. Might be a recipe for failure. But that's me. You'll notice, each place there is a Z bracket there are 2 bolts to secure the connection. If you add it to the bottom you can't do that. Because it's not designed to go there. Not to mention it would add another point of flex which may erode any advantage you had of doing chf in the first place. Good luck.